Update cache-id to fix github actions issue

Author: abn

.github/workflows/tests.yml

@@ -43,7 +43,7 @@ jobs:
       uses: actions/cache@v1
       with:
         path: .venv
-        key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
+        key: venv-${{ runner.os }}-py${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
     - name: Install dependencies
       run: |
         source $HOME/.poetry/env
@@ -81,7 +81,7 @@ jobs:
       uses: actions/cache@v1
       with:
         path: .venv
-        key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
+        key: venv-${{ runner.os }}-py${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
     - name: Install dependencies
       run: |
         source $HOME/.poetry/env
@@ -118,7 +118,7 @@ jobs:
       uses: actions/cache@v1
       with:
         path: .venv
-        key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
+        key: venv-${{ runner.os }}-py${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
     - name: Install dependencies
       run: |
         $env:Path += ";$env:Userprofile\.poetry\bin"